Scientists estimate that nearly 20 million lives were saved worldwide by COVID-19 vaccines during their first year. In a study published last week, they say even more deaths could have been prevented if global targets for vaccines had been reached. Fond du Lac County Public Health Officer Kim Mueller says throughout history vaccines have prevented death from a variety of diseases. Scientists at Imperial College London used data from 185 countries to estimate how many deaths were prevented by the vaccine effort. There are a lot of limitations in modeling studies, but independent experts agree that vaccines saved millions of lives.